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XAR File Format. Corel Xara drawing. The XAR extension is commonly used with files created by Xara Xtreme, a 2D vector graphics editor developed by the British company Xara, which is now a wholly-owned subsidiary of the German firm MAGIX AG.
Prior to Excel 2010, the Autosave feature creates hidden .xar files in C:\Users\ username \AppData\Roaming\Microsoft\Excel. The filenames are generated, and don't relate to the Workbook name. When you close Excel and select NO to save changes, the related temp .xar file is deleted PERMANENTLY... However... I have come up with a way of saving the files in this directory to a backup directory at regular intervals using Task Scheduler and Powershell-effectively backing up the autosave files.